Insulator and mold for casting the same



April 8, 1930. H. L. J. HAQUIN 1,754,101

INSULATOR AND MOLD FOR CASTING THE SAME Filed March 15, 1928 3Sheets-Sheet 1 April 8, 1930.

INSULATOR AND MOLD FOR CASTING THE SAME Filed March 15, 1928 3Sheets-Sheet 2 H. L. J. HAQUIN 1,754,101 I April 8, 1930. H. L. J.HAQUIN 1,754,101

1 INSULATOR AND MOLD FOR CASTING THE SAME Filed March 15, 1928 5Sheets-Sheet 3 view/MW Patented Apr." 8, 1930 PATENT OFFICE.

EEIIBI LOUIS JOSEPH HAQUIN, DI! VOYENNE, FRANCE DTSUIIL'LOB AND HOLD FOBCASTING THE SAME Application filed Ial'ch 15, 1928, Serial No.

The present invention relates to insulators and molds for castingthe'same.

Up to the present time, it has been found impossible to produce castglass. insulators -having an internal loop formed integrally therewithof the type generally provided in orcelain insulators.

ne of the objects of the invention is to provide a modified form ofinsulator which [0 permits a casting-operation to be effected. Anotherobject is to provide a special form of mold designed to produce theabove mentioned modified form of insulator.

Still further objects will appear in the 1;, course of the detaileddescription now to be given with reference. to the accompanyingdrawings, in which Fig. 1 is a section through the ordinary form ofporcelain insulator now current use; i

Fig. 2 is a section through a formof insulato'r constructed inaccordance with the present invention; j w 7 Fig. 3 is a view of thefinished insulator as-seen in transparent perspective;

Fig. fl: represents a mold, in section, designed to produce an insulatorof the type shown in Fig. 2;

. Fig. 5 is a section Fig. 4; d r

Fig. 6 illustrates the various mold closure devices in plan.

Fig. 7 shows, in perspective, the mold and core sections in separatedposition;

85 Figs. 8 and 9, illustrate, in the same manner as Figs. 4 and 5 adiflerent form of mold assembly.

' Referring to Fig. 1 of the drawings, there is shown the usual form ofporcelain insulator having an external portion AB and a loop portion N.The center of curvature C of surface AB is generally placedsubstantially at or below the surface of loop L,-thus making itdifiicult or impossible to 4:, move properly shaped cores into, and outof,

taken on line 5'-5 of shown a two part mold a,

261,793, and in Belgium October 10, 1927. i

the spaces constituting the hollow portions of the insulator.

To overcome this difficulty, the shape of the insulator has beenmodified in the man- 'ner shown in Fig. 2. Here center of curvature C isplaced outside of loop surface L and AB is giventhe form 1) of aspherical surface of radius OM, or 2) of a surface whose radiusincreases as GM moves away from point A. The reasons for this choice ofcurvature will appear in the course of the description to be given ofthe special cores used in the, casting operation. It is to be notedfurtheiqflthat the section of the loop is here modified so that distance0N either 00 remains constant or, gradually decreases in the course ofthe movement of point N from A to B Referring now to Figs. 3 to 5 of thedrawings, representing the special mold for cast- 6.; ing the abovedescribed insulator, there is a arranged to slide in guideways t, t andhaving a cavity 6 and a cavity 0 formed therein corresponding to theshape of the insulator shown in Figs. 2 and 3. Cavities band 0 form thewalls of the cris s-cross internal passages extending through theinsulator at right angles to one another (Fig. 3). The hollow portionsof the molded article or casting are. formed in part by a two part core03, d hingedly mounted on a pair of shafts f, f and arranged to be movedinto and out of the mold cavity by means of a pair of suspension rods 0,0, pivotally mounted on a double lever m, m, so fulcrumed at n andcounterbalanced at p. Stops 9 limit the downward movement of lever m andcore d, d while handles in, k permit either core section to be rotatedout of the mold. It will now be evident why the special curvatures ofthe insulator shown in Fig. 2 were given the values indicated. Inasmuchas core sections d must be removed by rotation, the curvatures of theskirt and of the loop portions of the mold and of the msulano tor mustbe chosen so as to permit such a movement to be effected, i. e. the axisof rotation of shafts f, f, should correspond to the position of point Cof Fig. 2. The mold is completed by a top closure h formed (1) of one ormore circular segments held in place. by bolts 2' as shown in Figs. 4and 5 or (2) of a pair of segments hinged at h and locked together attheir free extremities by any convenient device engaging either directlywith each segment or coacting with handles 6 i (Fig. 6). To assure core03, all being securely locked in place, a bar 8 may be wedged into placebetween handles la, la and ring h (1) may be made sufficiently wide tooverlap the top of the core surface, or (2) it may be fitted withL-shaped bars a arranged to be held firmly against the core by bolts '5as shown in Fig. 5, or again (3) it may be provided with. tenons v, 0adapted to engage in proper recesses formed in the core sections-asshown in Fig. 6. I

The manner in which the device 0 crates is practically evident from thefibregoing description. Core sections 03, d are first lowered intoplace; bar 8 is then applied so as to bring the core surfaces intocontact at g and ring it is mounted in position. After the charge hasbeen poured through gate 1', the core is lifted out and mold sections a,(1 moved apart or conversely.

In the form of mold shown in Figs. 8 and 9, the core sections, insteadof being mounted above the mold sections are-placed below the latter.This mold assembly functions in substantially the same manner as the oneshown in Fig. 4 and 5 except that, in opening the -mold, it is advisableto first move apart the mold sections and to then remove the cores.

It is to be noted that in the insulator, the novel form has been chosenmainly in view of facilitating the casting operation and that thespeciallyv designed mold is particularly adapted to the molding ofarticles having the contours and presenting the casting problem peculiarto insulators of the type de-- scribed. What; I claim is 1. A moldassembly comprising in com bination a pair of mold members adapted to bemoved towards and away from one another, said mold members having amolding cavity formed therein whose surface includes a bridge-likeportion extending between two parts thereof, and a pair of bent coremembers pivotally mounted on a-common axis,

said core members when inserted in operative position in the mold cavitypassing under said bridge-like portion of the latter and contactingthereunder. v

2. A structure as defined in claim 1 in combination with means forlocking said cores in operative position in the mold cavity.

3. A structure as defined in claim 1 in combination' with means forlocking said cores in operative'position in the mold cavity, and meansindependent of the mold members for supporting the cores.

4. A structure as defined in claim 1 in combination with a handle riidly mounted on each core, and a locking Far extending between saidhandles and tending to force the latter apart.

In testimony whereof I have hereunto set my hand.

HENRI LOUIS JOSEPH HAQUIN.

